STUDY ON THE SEISMOGENIC FAULT CHARACTERSTICS OF 2016 MW5.9 MENYUAN EARTHQUAKE BASED ON Sentinel -1A DATA
ZHENG Bo-wen1, GONG Wen-yu1, WEN Shao-yan1,2, ZHANG Ying-feng1, SHAN Xin-jian1, SONG Xiao-gang1, LIU Yun-hua1
1 State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;
2 Earthquake Administration of Xinjiang Uygur Autonomous Region, Urumqi 830011, China
Abstract:In this paper, we processed and analyzed the Sentinel-1A data by "two-pass" method and acquired the surface deformation fields of Menyuan earthquake. The results show the deformation occurred mainly in the south wall of fault, where uplift deformation is dominant. The uplift deformation is significantly larger than the subsidence and the maximum uplift of ascending and descending in the LOS is 6cm, 8cm respectively. Meanwhile, based on the Okada model, we use the ascending and descending passes data as constraints to invert jointly the fault distribution and source parameters through constructing fault model of different dip directions. The optimum fault parameters are:The dip is 43°, the strike is 128°with the mean rake of 85°. The maximum slip is about 0.27m. The inverted seismic moment M0 is 1.13×1018N·m, and the moment magnitude MW is 5.9. The SW-dipping Minyue-Damaying Fault is possibly the seismogenic fault, based on the comprehensive analysis of the focal mechanisms, aftershocks relocation results and the regional tectonic background. The focus property is dominated by thrust movement with a small amount of dextral strike-slip component. The earthquake is the result of local stress adjustment nearby the Lenglongling Fault under the background of northeastward push and growth of Tibet Plateau.
郑博文, 龚文瑜, 温少妍, 张迎峰, 单新建, 宋小刚, 刘云华. 基于Sentinel-1A的2016年青海门源MW5.9地震发震构造特征[J]. 地震地质, 2018, 40(4): 872-882.
ZHENG Bo-wen, GONG Wen-yu, WEN Shao-yan, ZHANG Ying-feng, SHAN Xin-jian, SONG Xiao-gang, LIU Yun-hua. STUDY ON THE SEISMOGENIC FAULT CHARACTERSTICS OF 2016 MW5.9 MENYUAN EARTHQUAKE BASED ON Sentinel -1A DATA. SEISMOLOGY AND GEOLOGY, 2018, 40(4): 872-882.
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